Cohesive osteogenic putty and materials therefor

Abstract

Described is an implantable medical material comprising a malleable, cohesive, shape-retaining putty including mineral particles, insoluble collagen fibers and soluble collagen. The medical material can be used in conjunction with biologically active factors such as osteogenic proteins to treat bone or other tissue defects in patients.

1. An implantable osteogenic medical material, comprising: a malleable, cohesive, shape-retaining putty comprising 60% to 75% by weight of an aqueous liquid medium and including a bone morphogenic protein incorporated at a level of about 0.6 mg/cc to about 2 mg/cc of the putty; said putty including mineral particles dispersed therein having an average particle diameter in the range of 0.4 mm to 5 mm at a level of 0.25 g/cc to 0.35 g/cc in the putty, the mineral particles comprising a synthetic ceramic; said putty further including insoluble collagen fibers at a level of 0.04 g/cc to 0.1 g/cc of the putty, and soluble collagen at a level of 0.01 g/cc to 0.08 g/cc of the putty; and with the further proviso that the weight ratio of insoluble collagen fibers to soluble collagen in the putty is in the range of 4:1 to 1:1, wherein the mineral particles form a scaffold for bone ingrowth and comprise biphasic calcium phosphate that has a tricalcium phosphate: hydroxyapatite weight ratio of 50:50 to 95:5. 
     
     
       2. The implantable osteogenic medical material of  claim 1 , wherein said putty is comprised of about 65% to about 75% of water. 
     
     
       3. The implantable osteogenic medical material of  claim 1 , wherein said weight ratio of insoluble collagen fibers to soluble collagen in the putty is in the range of about 75:25 to about 60:40. 
     
     
       4. The implantable osteogenic medical material of  claim 1 , wherein said bone morphogenic protein comprises BMP-2. 
     
     
       5. The implantable osteogenic medical material of  claim 4 , wherein said BMP-2 comprises recombinant human BMP-2. 
     
     
       6. The implantable osteogenic medical material of  claim 1 , wherein said insoluble collagen fibers are present in said putty at a level of 0.05 g/cc to 0.08 g/cc. 
     
     
       7. The implantable osteogenic medical material of  claim 1 , wherein said soluble collagen is present in said putty at a level of 0.02 to 0.05 g/cc. 
     
     
       8. The implantable osteogenic medical material of  claim 6 , wherein said soluble collagen is present in said putty at a level of 0.02 to 0.05 g/cc. 
     
     
       9. The implantable osteogenic medical material of  claim 1 , wherein said mineral particles have an average particle diameter in the range of about 0.4 to about  3.0 mm.    
     
     
       10. The implantable osteogenic medical material of  claim 1 , wherein said mineral particles have an average particle diameter in the range of about 0.4 to about  2.0 mm.    
     
     
       11. The implantable osteogenic medical material of  claim 1 , wherein: said weight ratio of insoluble collagen fibers to soluble collagen is about 75:25 to about 65:35; said mineral particles have an average particle diameter in the range of about 0.4 to about 4.0 mm; said putty includes the insoluble collagen fibers at a level of about 0.05 to 0.08 g/cc; said putty includes the soluble collagen at a level at about 0.02 to about 0.05 g/cc; and said bone morphogenic protein is incorporated at a level of about 0.8 mg/cc to about 1.8 mg/cc of the putty. 
     
     
       12. The implantable osteogenic medical material of  claim 11 , wherein said bone morphogenic protein comprises recombinant human BMP-2.